Vehicle Control System for Quiet Body Height Adjustment
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Solution Overview
Problem
Existing vehicle control systems face challenges in quickly adjusting body height while the brake force control device is operating, leading to increased noise, energy consumption, and undesirable events such as wheel slippage or rotation during braking operations.
Innovation Solution
A vehicle control system that includes a body-height adjusting device and a brake-force control device, where the operation-force lowering portion reduces the brake operation forces of at least one pair of wheel brakes when adjusting body height, allowing for quiet and energy-efficient adjustments even during braking, by permitting wheel rotation and preventing large changes in body height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the brake force control device operates to restrain wheel rotation during braking, then the vehicle can be stopped effectively, but the body-height adjusting device cannot quickly adjust the body height due to the restrained wheel rotation
Solution Approach 1:
The brake operation force is dynamically adjusted based on the body height adjustment state. When the body-height adjusting device is operating, the brake operation force is automatically lowered to permit wheel rotation and enable quick body height adjustment, while restoring normal brake force when adjustment is complete
Solution Approach 2:
The operation force parameter of the brake is changed (lowered) during body height adjustment to resolve the conflict between braking performance and adjustment speed. The control device modifies the brake force parameter to allow wheel rotation during suspension adjustment
2Object-generated harmful factors
If the brake operation force is maintained at normal levels during body height adjustment, then braking performance is preserved, but large sounds or noise are generated and energy is wasted
Solution Approach 1:
The brake operation force parameter is temporarily reduced during body height adjustment to eliminate noise and energy waste, then restored to normal levels when adjustment is complete, maintaining brake effectiveness while reducing harmful factors during adjustment operations
Solution Approach 2:
The control device preemptively lowers the brake operation force before body height adjustment begins to prevent noise and energy waste from occurring, rather than allowing the harmful effects to manifest and then correcting them
Data Source
AI summary
A vehicle control system for controlling a vehicle having a body, a pair of front wheels, and a pair of rear wheels, including a body-height adjusting device which adjusts four body heights each of which is defined as a relative-position relationship between corresponding one wheel of the pair of front wheels and the pair of rear wheels, and the body; and a brake-operation-force control device which controls respective operation forces of a pair of front-wheel brakes and a pair of rear-wheel brakes that restrain respective rotations of the pair of front wheels and the pair of rear wheels. The brake-operation-force control device includes an operation-force lowering portion which lowers, when the body-height adjusting device is adjusting at least one of the four body heights, the respective operation forces of at least one pair of brakes of the pair of front-wheel brakes and the pair of rear-wheel brakes, as compared with the respective operation forces when the body-height adjusting device is not adjusting any of the four body heights.